Apparent Power (VA) is the voltage-ampere requirement of a device. The Apparent power for DC circuits is simply the voltage (Vdc) times the current (Idc): VA = Vdc x Idc, and for AC circuits, VA is the product of the RMS (root mean square) voltage (VRMS) times the RMS current (IRMS).
Related Definitions in the Project: The Electrical Engineering; Property and Unit